JPS55165541A - Electron gun - Google Patents

Electron gun

Info

Publication number
JPS55165541A
JPS55165541A JP7415479A JP7415479A JPS55165541A JP S55165541 A JPS55165541 A JP S55165541A JP 7415479 A JP7415479 A JP 7415479A JP 7415479 A JP7415479 A JP 7415479A JP S55165541 A JPS55165541 A JP S55165541A
Authority
JP
Japan
Prior art keywords
circuit
filament
output
current measuring
output voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP7415479A
Other languages
Japanese (ja)
Inventor
Harumi Takenami
Masashi Otaka
Masahiro Kobayashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP7415479A priority Critical patent/JPS55165541A/en
Publication of JPS55165541A publication Critical patent/JPS55165541A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes

Abstract

PURPOSE:To previously take a preventive step, by generating an alarm signal before an optional time for the filament to be broken in an electron gun. CONSTITUTION:An electric current flowing in a filament 1 is measured by a current measuring circuit 8 and output to a recorder 10 to allow the recorder 10 to record a calibration curve of time aging for an output voltage proportional to the current value till the filament 1 is disconnected. A comparator circuit 9 compares an output of the current measuring circuit 8 with that of a reference voltage generating circuit 11, and the display element of a display circuit 12 is turned on when the output voltage of the current measuring circuit 8 comes to be at most the output voltage of the reference voltage generating circuit 11.
JP7415479A 1979-06-11 1979-06-11 Electron gun Pending JPS55165541A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7415479A JPS55165541A (en) 1979-06-11 1979-06-11 Electron gun

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7415479A JPS55165541A (en) 1979-06-11 1979-06-11 Electron gun

Publications (1)

Publication Number Publication Date
JPS55165541A true JPS55165541A (en) 1980-12-24

Family

ID=13538946

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7415479A Pending JPS55165541A (en) 1979-06-11 1979-06-11 Electron gun

Country Status (1)

Country Link
JP (1) JPS55165541A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59191252A (en) * 1983-04-15 1984-10-30 Toshiba Corp Fluorescent lamp
WO2000024229A1 (en) * 1998-10-22 2000-04-27 Safegate International Ab Deteriorated filament detection

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59191252A (en) * 1983-04-15 1984-10-30 Toshiba Corp Fluorescent lamp
JPH022265B2 (en) * 1983-04-15 1990-01-17 Toshiba Electric Equip
WO2000024229A1 (en) * 1998-10-22 2000-04-27 Safegate International Ab Deteriorated filament detection
JP2002528871A (en) * 1998-10-22 2002-09-03 セイフゲート インターナショナル アーベー Method of detecting filament with reduced quality of lighting device
US6556017B1 (en) 1998-10-22 2003-04-29 Safegate International Ab Deteriorated filament detection

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